I called the LFS store today to see what they had stockwise, and they said they had a red terror in, I kind of got all giddy inside; anyway, they said it was about 3/4" and had no black in the dorsal fin. Would it be easily discernible if it was a male at that age/length? I know the females have the black in their dorsal, and that is what I'm looking for specifically. Any way to tell at this point?